The Family of Imran
وَإِذْ قَالَتِ ٱلْمَلَـٰٓئِكَةُ يَـٰمَرْيَمُ إِنَّ ٱللَّهَ ٱصْطَفَىٰكِ وَطَهَّرَكِ وَٱصْطَفَىٰكِ عَلَىٰ نِسَآءِ ٱلْعَـٰلَمِينَ
And [mention] when the angels said, "O Mary, indeed Allah has chosen you and purified you and chosen you above the women of the worlds.
Nearby ayahs help place verse 3:42 in sequence and meaning.
قَالَ رَبِّ أَنَّىٰ يَكُونُ لِى غُلَـٰمٌ وَقَدْ بَلَغَنِىَ ٱلْكِبَرُ وَٱمْرَأَتِى عَاقِرٌ ۖ قَالَ كَذَٰلِكَ ٱللَّهُ يَفْعَلُ مَا يَشَآءُ
He said, "My Lord, how will I have a boy when I have reached old age and my wife is barren?" The angel said, "Such is Allah; He does what He wills."
قَالَ رَبِّ ٱجْعَل لِّىٓ ءَايَةً ۖ قَالَ ءَايَتُكَ أَلَّا تُكَلِّمَ ٱلنَّاسَ ثَلَـٰثَةَ أَيَّامٍ إِلَّا رَمْزًا ۗ وَٱذْكُر رَّبَّكَ كَثِيرًا وَسَبِّحْ بِٱلْعَشِىِّ وَٱلْإِبْكَـٰرِ
He said, "My Lord, make for me a sign." He Said, "Your sign is that you will not [be able to] speak to the people for three days except by gesture. And remember your Lord much and exalt [Him with praise] in the evening and the morning."
يَـٰمَرْيَمُ ٱقْنُتِى لِرَبِّكِ وَٱسْجُدِى وَٱرْكَعِى مَعَ ٱلرَّٰكِعِينَ
O Mary, be devoutly obedient to your Lord and prostrate and bow with those who bow [in prayer]."
ذَٰلِكَ مِنْ أَنۢبَآءِ ٱلْغَيْبِ نُوحِيهِ إِلَيْكَ ۚ وَمَا كُنتَ لَدَيْهِمْ إِذْ يُلْقُونَ أَقْلَـٰمَهُمْ أَيُّهُمْ يَكْفُلُ مَرْيَمَ وَمَا كُنتَ لَدَيْهِمْ إِذْ يَخْتَصِمُونَ
That is from the news of the unseen which We reveal to you, [O Muhammad]. And you were not with them when they cast their pens as to which of them should be responsible for Mary. Nor were you with them when they disputed.